Anyone on here a long time RP user? I'm looking for any feedback on this stuff. The UOA section is a bit thin on RP results. I just recently changed over from M1 5W20 to RP 5W20 in my '08 Mustang GT mainly out of curiosity to try something new. Please don't turn this into a "try Amsoil or PP" thread as I am only interested in anyone's experience with RP. Thanks!